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Combined Variance of Two Groups
For two groups:
$$\sigma^2=\frac{n_1(\sigma_1^2+\bar{x}_1^2)+n_2(\sigma_2^2+\bar{x}_2^2)}{n_1+n_2}-\bar{x}^2$$
Usage
- Used to calculate the variance of two combined datasets.
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Combined Variance of Two Groups
For two groups:
$$\sigma^2=\frac{n_1(\sigma_1^2+\bar{x}_1^2)+n_2(\sigma_2^2+\bar{x}_2^2)}{n_1+n_2}-\bar{x}^2$$
Usage
- Used to calculate the variance of two combined datasets.
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